The diagnostic blind spot of spirometric staging in biomass-related non-smoking chronic obstructive pulmonary disease: a cross-sectional study of spirometry-diffusion discordance in a rural South Indian population. Monaldi Arch Chest Dis [Internet]. 2026 Oct. 12 [cited 2026 Oct. 12]; Available from: https://www.monaldi-archives.org/macd/article/view/4174